diff --git a/payloads/libpayload/include/archive.h b/payloads/libpayload/include/archive.h
new file mode 100644
index 0000000..47dc93c
--- /dev/null
+++ b/payloads/libpayload/include/archive.h
@@ -0,0 +1,92 @@
+/*
+ * This file is part of the libpayload project.
+ *
+ * Copyright (C) 2015 The ChromiumOS Authors.  All rights reserved.
+ *                 written by Daisuke Nojiri <dnojiri@chromium.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef __ARCHIVE_H
+#define __ARCHIVE_H
+
+#include <stdint.h>
+
+/*
+ * Archive file layout:
+ *
+ *  +----------------------------------+
+ *  |           root header            |
+ *  +----------------------------------+
+ *  |         file_header[0]           |
+ *  +----------------------------------+
+ *  |         file_header[1]           |
+ *  +----------------------------------+
+ *  |              ...                 |
+ *  +----------------------------------+
+ *  |         file_header[count-1]     |
+ *  +----------------------------------+
+ *  |         file(0) content          |
+ *  +----------------------------------+
+ *  |         file(1) content          |
+ *  +----------------------------------+
+ *  |              ...                 |
+ *  +----------------------------------+
+ *  |         file(count-1) content    |
+ *  +----------------------------------+
+ */
+
+#define VERSION		0
+#define CBAR_MAGIC	"CBAR"
+#define NAME_LENGTH	32
+
+/* Root header */
+struct directory {
+	char magic[4];
+	uint32_t version;	/* version of the header. little endian */
+	uint32_t size;		/* total size of archive. little endian */
+	uint32_t count;		/* number of files. little endian */
+};
+
+/* File header */
+struct dentry {
+	/* file name. null-terminated if shorter than NAME_LENGTH */
+	char name[NAME_LENGTH];
+	/* file offset from the root header. little endian */
+	uint32_t offset;
+	/* file size. little endian */
+	uint32_t size;
+};
+
+static inline struct dentry *get_first_dentry(const struct directory *dir)
+{
+	return (struct dentry *)(dir + 1);
+}
+
+static inline uint32_t get_first_offset(const struct directory *dir)
+{
+	return sizeof(struct directory) + sizeof(struct dentry) * dir->count;
+}
+
+#endif